O'Neill, E. (2019). Gray day: My undercover mission to expose America's first cyber spy (First edition.). Crown Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रO'Neill, Eric. Gray Day: My Undercover Mission to Expose America's First Cyber Spy. First edition. New York: Crown Publishers, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रO'Neill, Eric. Gray Day: My Undercover Mission to Expose America's First Cyber Spy. First edition. Crown Publishers, 2019.
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